Front-end module and television set

1. A front-end module for receiving analog and digital broadcast signals, comprising: frequency conversion means configured to convert an input BS/CS digital television broadcast RF signal into a BS/CS digital television broadcast baseband signal; digital satellite demodulation means configured to digitally demodulate said BS/CS digital television broadcast baseband signal; intermediate frequency conversion means configured to split an input terrestrial broadcasting RF signal into VHF, CATV, and UHF bands which are subjected to processes including tuning, amplification, and image cancellation, before converting the processed signal into a terrestrial broadcasting intermediate frequency signal; analog demodulation means configured to split said terrestrial broadcasting intermediate frequency signal into an analog audio signal and a analog video signal, before demodulating said analog audio signal and said analog video signal; digital terrestrial demodulation means configured to adjust levels of said terrestrial broadcasting intermediate frequency signal and to subject the level-adjusted signal to selective frequency band limitation, before digitally demodulating the frequency band-limited signal; filtering means configured to reduce harmonics in the demodulated signals output by said digital satellite demodulation means and said digital terrestrial demodulation means; and a grounding arrangement common to a digital and an analog circuit sections.

2. The front-end module according to claim 1 , wherein said grounding arrangement is patterned in such a manner that a return current from a power supply for said analog circuit section stays in a ground either immediately below or close to said analog circuit section.

3. The front-end module according to claim 1 , wherein said frequency conversion means and said analog demodulation means are disposed in such a manner as to be isolated from each other.

4. The front-end module according to claim 1 , further comprising a branching circuit configured to branch an input RF signal into a BS/CS digital television broadcast RF signal and a terrestrial broadcasting RF signal.

5. The front-end module according to claim 1 , wherein said digital satellite demodulation means and said digital terrestrial demodulation means are implemented by a single LSI chip, and wherein the demodulated output signals from said LSI chip are MPEG-2 transport streams.

6. A television set for receiving analog and digital broadcast signals, comprising: a front-end module configured to receive an input BS/CS digital television broadcast RF signal, demodulate the received signal into a demodulated signal, and output the demodulated signal as a transport stream, said front-end module further receiving an input terrestrial broadcasting and demodulating the received broadcast analogically into analog terrestrial video/audio signals, said front-end module further demodulating digitally said terrestrial broadcasting into a demodulated signal and outputting the demodulated signal as a transport stream; decoding means configured to decode the transport streams output by said front-end module into digital video/audio signals; video/audio processing means configured to process said analog terrestrial video/audio signals output by said front-end module and said digital video/audio signals decoded by said decoding means, into a video signal and an audio signal in output form; video output means configured to output said video signal output by said video/audio processing means; and audio output means configured to output said audio signal output by said video/audio processing means, wherein said front-end module includes: frequency conversion means configured to convert an input BS/CS digital television broadcast RF signal into a BS/CS digital television broadcast baseband signal; digital satellite demodulation means configured to digitally demodulate said BS/CS digital television broadcast baseband signal; intermediate frequency conversion means configured to split an input terrestrial broadcasting RF signal into VHF, CATV, and UHF bands which are subjected to processes including tuning, amplification, and image cancellation, before converting the processed signal into a terrestrial broadcasting intermediate frequency signal; analog demodulation means configured to split said terrestrial broadcasting intermediate frequency signal into an analog audio signal and a analog video signal, before demodulating said analog audio signal and said analog video signal; digital terrestrial demodulation means configured to adjust levels of said terrestrial broadcasting intermediate frequency signal and to subject the level-adjusted signal to selective frequency band limitation, before digitally demodulating the frequency band-limited signal; filtering means configured to reduce harmonics in the demodulated signals output by said digital satellite demodulation means and said digital terrestrial demodulation means; and a grounding arrangement common to a digital and an analog circuit sections.

7. The television set according to claim 6 , further comprising two units of said front-end module, said decoding means, and said video/audio processing means each in order to provide two-screen display.

8. The television set according to claim 6 , wherein said grounding arrangement is patterned in such a manner that a return current from a power supply for said analog circuit section stays in a ground either immediately below or close to said analog circuit.

9. The television set according to claim 6 , wherein said frequency conversion means and said analog demodulation means are disposed in a manner isolated from each other.